Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: IThe Microscopic Origin of Residual Stress for Flat Self-Actuating Piezoelectric Cantilevers
Materials are important to mankind because of the benefits that can be derived from the manipulation of their properties, for example electrical conductivity, dielectric constant, magnetization, optical transmittance, strength and toughness. Materials science is a broad field and can be considered to be an interdisciplinary area. Included within it are the studies of the structure and properties of any material, the creation of new types of materials, and the manipulation of a material's properties to suit the needs of a specific application....
The introduction of the technology for bonded composite repairs of metallic
airframe structures could not have come at a more opportune time. Today, many
countries are facing the challenge of aging aircraft in their inventories. These
airframes are degrading due to damage from fatigue cracking and corrosion.
Repair with dependable techniques to restore their structural integrity is
mandatory. The concept of using bonded composite materials as a means to
maintain aging metallic aircraft was instituted in Australia approximately thirty
Despite the wide availability of literature on welding processes, a need exists to regularly update the engineering community on advancements in joining techniques of similar and dissimilar materials, in their numerical modeling, as well as in their sensing and control.
Acoustic fatigue is due to a very high intensity excitation as a result of pressure
waves caused by either engine or aerodynamic effects. Acoustically-induced
cracking has occurred on the external surface of the lower nacelle and aft fuselage
skins on the F/A-18, as illustrated in Figure 19.1. In the former region, overall
sound pressure levels greater than 170dB have been measured in flight [l]. These
high sound pressure levels appear to be a result of an aerodynamic disturbance at
the inlet lip....
These health impacts involve about $10 billion in annual economic damages. Loss of life and
pain and suffering account for about $4.1 and $4.8 billion of this total. Annual health care costs
of air pollution are in the order of $600 million; lost productivity accounts for an additional $560
million in annual damages. These economic damages are expected to increase substantially over
the next 20 years.
The ASAP will reduce health and economic damages by about 11% overall, compared to the
status quo. The residual damages (i.e.
Non-point source controls washed off fields is the largest source of agricultural pollution in
the United States. Farmers may utilize to reduce runoff flows and retain soil on their fields. Common
techniques include contour plowing, crop mulching, crop rotation, planting perennial crops and
installing riparian buffers.
Nutrients nitrogen and phosphorus are typically applied to farmland as commercial fertilizer;
animal manure; or spraying of municipal or industrial waste water (effluent) or sludge.
Remedial strategies for petroleum UST sites that include a combination of
active source zone treatment with enhanced natural attenuation outside the
contaminant plume core may consider chemical oxidation technologies. Many
chemical oxidation techniques also provide residual dissolved oxygen that is used
by aerobic microorganisms to biodegrade contaminants. In addition, these
technologies may also oxidize reduced electron acceptors (e.g., nitrogen to nitrate,
sulfides to sulfate), which are then used by anaerobic microorganisms to
The obvious alternative to polling for data is to dis-
tribute that data, as it becomes available, to lists of
subscribers. This approach may be adequate for small
subscription lists (for example, e-mail lists), but it will
not scale to accommodate the growing subscription de-
mands of Web site syndication. Furthermore, while such
an approach may reduce the overall bandwidth usage of
RSS (by reducing unnecessary fetches), it does nothing
to alleviate the per-update stress on network links close
to the source.
14-3-3 proteins belong to a family of conserved molecules expressed in all
eukaryotic cells, which play an important role in a multitude of signaling
pathways. 14-3-3 proteins bind to phosphoserine⁄phosphothreonine motifs
in a sequence-specific manner. More than 200 14-3-3 binding partners have
been found that are involved in cell cycle regulation, apoptosis,
stress responses, cell metabolism and malignant transformation.
Stress-activated protein kinase (SAPK) signaling plays essential roles in eliciting adequate cellular responses to stresses and proinﬂammatory cytokines. SAPK pathways are composed of three successive protein kinase reactions. The phosphorylation of SAPK signaling components on Ser/Thr or Thr/Tyr residues suggests the involvement of various protein phosphatases in the negative regulation of these systems.
The three most recently completed projects comprise of a total 373 apartments, however strong
pre-sales have resulted in only 16% of the supply remaining. The Stamford Residences & The
Reynell Terraces only has 8% of residual stock yet to be absorbed with the sale of a terrace for an
undisclosed price being the most recent transaction. There is no new supply anticipated within the
Northern Precinct until at least 2015 ensuring demand for new and established apartments will
The ÔMediterraneanÕ variant of glucose-6-phosphate dehydrogenase (G6PD) deﬁciency is due to the C563CT point mutation, leading to replacement of Ser with Phe at position 188, resulting in acute haemolysis triggered by oxidants. Previous work has shown increased formation of altered aspartate residues in membrane proteins during cell ageing and in response to oxidative stress in normal erythrocytes. These abnormal residues are speciﬁcally recognized by the repair enzyme L-isoaspartate (D-aspartate) protein O-methyltransferase (PCMT; EC 220.127.116.11). ...
Yeast elongation factor 2 is an essential protein that contains two highly
conserved threonine residues, T56 and T58, that could potentially be phos-phorylated by the Rck2 kinase in response to environmental stress. The
importance of residues T56 and T58 for elongation factor 2 function in
yeast was studied using site directed mutagenesis and functional comple-mentation.
Small heat shock proteins (sHSPs) function as molecular chaperones, pre-venting stress induced aggregation of partially denatured proteins and pro-moting their return to native conformations when favorable conditions
pertain. Sequence similarity between sHSPs resides predominately in an
internal stretch of residues termed the a-crystallin domain, a region usually
flanked by two extensions.
Human cells contain two homologs of the yeast RAD23 protein, hHR23A
and hHR23B, which participate in the DNA repair process. hHR23B hou-ses a domain (residues 277–332, called XPCB) that binds specifically and
directly to the xeroderma pigmentosum group C protein (XPC) to initiate
nucleotide excision repair (NER). This domain shares sequence homology
with a heat shock chaperonin-binding motif that is also found in the stress-inducible yeast phosphoprotein STI1.
Escherichia coliproteinY (pY) binds to the small ribosomal
subunit and stabilizes ribosomes against dissociation when
bacteria experience environmental stress. pY inhibits trans-lationin vitro,most probably by interferingwith the binding
of the aminoacyl-tRNA to the ribosomal A site. Such a
translational arrest may mediate overall adaptation of cells
to environmental conditions. We have determined the 3D
solution structure of a 112-residue pY and have studied its
backbone dynamic by NMRspectroscopy. ...