Search PubMed⌕ Search

Biomedical subjects

Jing Zhu

Publications and source records attributed to Jing Zhu.

60 records · Page 4Linked to original sources
PubMed2002

Artificial lamellar mesostructures to WS(2) nanotubes.

A direct pyrolysis method from artificial lamellar mesostructures to nanotubes was developed for the synthesis of tungsten disulfide (WS(2)) nanotubes. In this process, a tungsten sulfide artificial lamellar mesostructure composite with intercalated cetyltrimethylammonium cations (WS-L) was prepared on the basis of the recently developed template self-assembly of anionic tungstates (WS(4)(2-)) and cationic surfactant molecules (CTA(+)) in solution under appropriate conditions. After heating of this inorganic-surfactant lamellar composite material in an argon atmosphere to 850 degrees C, bulk quantities of uniform WS(2) nanotubes with diameters of 5-37.5 nm and lengths ranging from 0.2 to 5 microm were produced, which revealed a general rolling mechanism of layered sheets for tubule formation. The observations of transmission electron microscopy are in good agreement with the proposed rolling mechanism.

Journal Article↗
PubMed2002

Synthesis and characterization of several one-dimensional nanomaterials.

Some synthesis methods to fabricate one-dimensional nanomaterials, including template-assisted growth, simple catalyst-free growth and chemical vapor deposition, and the characterization methods by transmission electron microscopy, for example, determination of mechanical properties of ceramic nanowires and helicity distribution of bundles of single-walled carbon nanotubes are reported and discussed.

Journal Article↗
PubMed2002

Relationship between tissue factor expression and hepatic metastasis and prognosis in rectal cancer.

OBJECTIVE: To investigate the correlation between tissue factor (TF) expression and hepatic metastasis and prognosis in rectal cancer. METHODS: TF expression was retrospectively studied by immunohistochemical method in specimens of 40 rectal cancer, 3 hepatic metastasis and 6 benign adenoma with relation to their clinicopathologic data. RESULTS: 1. TF expression was detected in 20 (50%) of the 40 primary rectal cancer specimens and all the 3 hepatic metastatic specimens, but not in the 6 benign adenoma or normal mucosa of rectum, 2. Significant correlation was observed between TF expression and synchronic hepatic metastasis (P = 0.002) and heterochronic hepatic metastasis (P = 0.001) and 3. TF was a risk factor for the prognosis of primary rectal cancer (P = 0.024). CONCLUSION: Tissue factor expression may play a role in the process of developing hepatic metastasis. It may be considered as a new clinical indicator for monitor of hepatic metastasis and prognosis of primary rectal cancer.

Adenoma↗
PubMedDate not supplied

Virtual local target method for avoiding local minimum in potential field based robot navigation.

A novel robot navigation algorithm with global path generation capability is presented. Local minimum is a most intractable but is an encountered frequently problem in potential field based robot navigation. Through appointing appropriately some virtual local targets on the journey, it can be solved effectively. The key concept employed in this algorithm are the rules that govern when and how to appoint these virtual local targets. When the robot finds itself in danger of local minimum, a virtual local target is appointed to replace the global goal temporarily according to the rules. After the virtual target is reached, the robot continues on its journey by heading towards the global goal. The algorithm prevents the robot from running into local minima anymore. Simulation results showed that it is very effective in complex obstacle environments.

Algorithms↗