1,464 research outputs found
Innovations in hematopoietic stem-cell mobilization: A review of the novel CXCR4 inhibitor motixafortide
Hematopoietic stem-cell transplantation (HCT) and stem-cell-based gene therapies rely on the ability to collect sufficient CD34+ hematopoietic stem and progenitor cells (HSPCs), typicall
Suicide genes: Monitoring cells in patients with a safety switch
Clinical trials increasingly incorporate suicide genes either as direct lytic agents for tumors or as safety switches in therapies based on genetically modified cells. Suicide genes can also be used as non-invasive reporters to monitor the biological consequences of administering genetically modified cells to patients and gather information relevant to patient safety. These genes can monitor therapeutic outcomes addressable by early clinical intervention. As an example, our recent clinical trial used 18F-9-(4-fluoro-3-hydroxymethylbutyl)guanine (18FHBG) and PET/CT scans to follow T cells transduced with herpes simplex virus thymidine kinase (TK) after administration to patients. Guided by preclinical data we ultimately hope to discern whether a particular pattern of transduced T cell migration within patients reflects early development of Graft vs. Host Disease (GvHD). Current difficulties in terms of choice of suicide gene, biodistribution of radiolabeled tracers in humans versus animal models, and threshold levels of genetically modified cells needed for detection by PET/CT are discussed. As alternative suicide genes are developed, additional radiolabel probes suitable for imaging in patients should be considered
ΠΠ²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΡΠΉ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΊΠΎΠ½ΡΡΡΠΎΠ² ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π΅ΡΡΠ΅Ρ ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°
ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΌΠΎΠ΄Π΅Π»Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΠΏΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΡΡΠΎΠΉ Π½Π΅ΡΡΠΈ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½Π°Ρ Π² Honeywell UniSim design suite.
Π¦Π΅Π»ΡΡ ΠΌΠ°Π³ΠΈΡΡΠ΅ΡΡΠΊΠΎΠΉ Π΄ΠΈΡΡΠ΅ΡΡΠ°ΡΠΈΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ ΠΌΠΎΠ½ΠΈΡΠΎΡΠΈΠ½Π³Π° ΠΊΠ»ΡΡΠ΅Π²ΡΡ
ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΊΠΎΠ½ΡΡΡΠΎΠ² Π°Π²ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π΅ΡΡΠ΅Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°.
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ: Π°Π½Π°Π»ΠΈΠ· ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΌΠΎΠ½ΠΈΡΠΎΡΠΈΠ½Π³Π° ΠΊΠΎΠ½ΡΡΡΠΎΠ² ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ, Π°Π½Π°Π»ΠΈΠ· Π²Π»ΠΈΡΠ½ΠΈΡ ΠΊΠΎΠ½ΡΡΡΠΎΠ² ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π½Π° ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΏΡΠΎΡΠ΅ΡΡ, ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΈΠ½ΡΠ΅ΡΡΠ΅ΠΉΡΠ° Π²ΡΠ²ΠΎΠ΄Π° ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ², ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΡΠΈΡΡΠ΅ΠΌΡ ΠΌΠΎΠ½ΠΈΡΠΎΡΠΈΠ½Π³Π° ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π½Π° ΡΠ·ΡΠΊΠ΅ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ C#, ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ½ΡΡΠΎΠ»ΡΠ½ΡΡ
ΠΊΠ°ΡΡ Π¨ΡΡ
Π°ΡΡΠ° Ρ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΌ Π°Π½Π°Π»ΠΈΠ·ΠΎΠΌ Π΄Π°Π½Π½ΡΡ
.The object of research is a model of the technological process of crude oil refining developed in the Honeywell UniSim design suite.
The aim of the master's thesis is to develop and study an automated system for monitoring key performance indicators of the loopd of automatic regulation of petrochemical production.
This work presents: an analysis of methods for monitoring control loops, an analysis of the influence of control loops on a technological process, the development of an interface for outputting technological parameters, the development of a process monitoring system in the C # programming language, the construction of Shewhart control charts with automatic data analysis
Transmit simulation and receive optimizations for 802.11b networks
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.Includes bibliographical references (p. 72-73).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.The simulation presented in this paper provides an implementation of a full simulated transmit chain from packet encoding through base band modulation for the 802.11b wireless networking standard. This forward transmit chain is coupled with a physical channel simulation that can introduce a number of different channel effects to simulate interference caused in the real world. Packets which the transmit simulation produces can be sent to a receive simulation to test design parameters or can be modulated and sent to 802.11b hardware to test hardware implementation. Using former procedure, this paper also evaluates implementations of a Phase lock loop used to track Frequency Doppler and a Time Tracking Loop used to track Code Doppler under various Signal to Noise levels. The results from these simulations can be used to optimize various receive parameters and algorithms.by Pascal F. Rettig.M.Eng
Coherent excitations and electron phonon coupling in Ba/EuFe_2As_2 compounds investigated by femtosecond time- and angle-resolved photoemission spectroscopy
We employed femtosecond time- and angle-resolved photoelectron spectroscopy
to analyze the response of the electronic structure of the 122 Fe-pnictide
parent compounds Ba/EuFe_2As_2 and optimally doped BaFe_{1.85}Co_{0.15}As_2
near the \Gamma point to femtosecond optical excitation. We identify pronounced
changes of the electron population within several 100 meV above and below the
Fermi level, which we explain as combination of (i) coherent lattice
vibrations, (ii) a hot electron and hole distribution, and (iii) transient
modifications of the chemical potential. The response of the three different
materials is very similar. In the Fourier transformation of the time-dependent
photoemission intensity we identify three modes at 5.6, 3.3, and 2.6 THz. While
the highest frequency mode is safely assigned to the A_{1g} mode, the other two
modes require a discussion in comparison to literature. The time-dependent
evolution of the hot electron distribution follows a simplified description of
a transient three temperature model which considers two heat baths of lattice
vibrations, which are more weakly and strongly coupled to transiently excited
electron population. Still the energy transfer from electrons to the strongly
coupled phonons results in a rather weak, momentum-averaged electron-phonon
coupling quantified by values for \lambda between 30 and 70 meV^2.
The chemical potential is found to present a transient modulation induced by
the coherent phonons. This change in the chemical potential is particularly
strong in a two band system like in the 122 Fe-pnictide compounds investigated
here due to the pronounced variation of the electrons density of states close
to the equilibrium chemical potential.Comment: 10 pages, 6 figure
Energy dissipation in the time domain governed by bosons in a correlated material
In complex materials various interactions play important roles in determining
the material properties. Angle Resolved Photoelectron Spectroscopy (ARPES) has
been used to study these processes by resolving the complex single particle
self energy and quantifying how quantum interactions modify bare
electronic states. However, ambiguities in the measurement of the real part of
the self energy and an intrinsic inability to disentangle various contributions
to the imaginary part of the self energy often leave the implications of such
measurements open to debate. Here we employ a combined theoretical and
experimental treatment of femtosecond time-resolved ARPES (tr-ARPES) and show
how measuring the population dynamics using tr-ARPES can be used to separate
electron-boson interactions from electron-electron interactions. We demonstrate
the analysis of a well-defined electron-boson interaction in the unoccupied
spectrum of the cuprate BiSrCaCuO characterized by an
excited population decay time constant that maps directly to a
discrete component of the equilibrium self energy not readily isolated by
static ARPES experiments.Comment: 19 pages with 6 figure
- β¦