48,362 research outputs found
Interaction of Chinese institutions with host governments in dam construction: the Bui Dam in Ghana
No full textThe study analyses the role of Chinese companies and financing institutions and Ghanaian governmental agencies in planning and constructing the Bui Dam. The analysis focuses on the division of responsibilities between Sinohydro and China Exim Bank on the one side and the Ghanaian government on the other side. The findings show that environmental and resettlement planning for Bui was commissioned and financed by the Government of Ghana without Sinohydro’s involvement. The obligation of the firm is to abide by the environmental regulations that are monitored by the regulatory authorities. The role of Sinohydro consists in building the dam, maintaining the construction site, contracting workers, and providing for workers’ health and safety. The firm has no role in resettlement, which is carried out by the Bui Power Authority. While there is clear evidence that the Bui Power Authority does not follow the recommendations of the Resettlement Planning Framework, Sinohydro appears to abide largely by the conditions set out in the Environmental Impact Assessment study whose implementation is monitored by the Ghanaian Environmental Protection Agency and the Ghanaian Water Resources Commission
Top Management Team Diversity: A systematic Review
No full textEmpirical research investigating the impact of top management team (TMT)
diversity on executives’ decision making has produced inconclusive results.
To synthesize and aggregate the results on the diversity-performance
link, a meta-regression analysis (MRA) is conducted. It integrates more
than 200 estimates from 53 empirical studies investigating TMT diversity
and its impact on the quality of executives’ decision making as reflected
in corporate performance. The analysis contributes to the literature by
theoretically discussing and empirically examining the effects of TMT diversity
on corporate performance. Our results do not show a link between TMT
diversity and performance but provide evidence for publication bias. Thus,
the findings raise doubts on the impact of TMT diversity on performance
Sharp L^p estimates for Schrödinger groups on spaces of homogeneous type
No full textWe prove an L^p estimate for the Schrodinger group e^{-itL}
generated by a semibounded, selfadjoint operator L on a metric measure space
X of homogeneous type. The assumptions on L are a mild L^{p_0} to L^{p_0}'
smoothing estimate and a mild L^2 to L^2 off--diagonal estimate for the
corresponding heat kernel e^{-tL}
Chinese hydropower companies and environmental norms in countries of the global South: the involvement of Sinohydro in Ghana’s Bui Dam
No full textThe paper examines the role of environmental norms in Chinese overseas investment in hydropower dams, exemplified by Sinohydro’s involvement in the Bui Dam in Ghana. While the investment of Western companies in hydropower dams in the global South is decreasing owing to changing notions of sustainability in the West, the investment of Chinese companies in hydro dams in Africa, Southeast Asia and Latin America is accelerating at great speed. The emergence of Chinese companies in international markets in the context of China’s Going Abroad strategy has sparked a debate on whether China can be considered a norm-changer in international development. The paper considers this question in the context of the status of environmental norms in Sinohydro’s investment in Ghana’s Bui Dam. The paper argues that the role of international norms in Chinese investment is dependent on two factors: the contractual arrangements under which Chinese companies operate abroad and the political institutions of host countries
Sharp Lp estimates for Schrödinger groups on spaces of homogeneous type
No full textWe prove an Lp estimate (Equation Presented) for the Schrödinger group generated by a semibounded, self-adjoint operator L on a metric measure space X of homogeneous type (where n is the doubling dimension of X). The assumptions on L are a mild Lp0 → Lp' 0 smoothing estimate and a mild L2 → L2 off-diagonal estimate for the corresponding heat kernel e -tL. The estimate is uniform for φ varying in bounded sets of S(R), or more generally of a suitable weighted Sobolev space. We also prove, under slightly stronger assumptions on L, that the estimate extends to (Equation Presented) with uniformity also for θ varying in bounded subsets of (0,+∞). For nonnegative operators uniformity holds for all θ > 0
The L-p-to-L-q boundedness of commutators with applications to the Jacobian operator
No full textSupplying the missing necessary conditions, we complete the characterisation of the L-p -> L-q boundedness of commutators [b, T] of pointwise multiplication and Calderon-Zygmund operators, for arbitrary pairs of 1 q, our results are new even for special classical operators with smooth kernels. As an application, we show that every f is an element of L-p(R-d) can be represented as a convergent series of normalised Jacobians J(u) = det del uof u is an element of (over dot(W))(1,dp)(R-d)(d). This extends, from p = 1 to p > 1, a result of Coifman, Lions, Meyer and Semmes about J:. (over dot(W))(1,d)(R-d)(d) -> H-1(R-d), and supports a conjecture of Iwaniec about the solvability of the equation Ju = f is an element of L-p(R-d). (C) 2021 The Author(s). Published by Elsevier Masson SAS.Peer reviewe
Nuclear medicine methods for the diagnosis of adrenal tumors
No full textAdrenal scintigraphy using 131I-6-beta-iodomethyl-19-norcholesterol or 6-methyl-75Se-methyl-19-norcholesterol is a function-dependent imaging method which, in association with high-resolution spatial imaging techniques, plays an essential role in the study of adrenocortical hyperfunction. It can distinguish between bilateral cortical hyperplasia and monolateral adenoma or carcinoma and can lateralise the adenoma. In patients with Cushing syndrome, in addition to allowing a distinction to be made between ACTH-dependent forms and independent forms, adrenocortical scintigraphy is particularly appropriate to identify non-common forms of adenomatous hyperplasia. Adrenocortical scintigraphy, performed during dexamethasone administration, is an accurate mean of differentiating bilateral adrenal hyperplasia from monolateral forms (adenoma or carcinoma) in patients with Conn's syndrome. Owing to the gradual spread of high-resolution spatial imaging techniques, the problem of the diagnostic classification of so-called "incidentalomas" (clinically silent masses discovered by chance) is a subject of considerable interest. Adreno-cortical scintigraphy appears to be able to provide an important contribution to identifying the functional behaviour of these tumours. Since the early 80s meta-iodobenzyl-guanidine (MIBG), marked with 131I or 123I, with a structure similar to norepinephrine and characterized by selective tropism for sympathetic and chromaffin tissue, has been used for the scintigraphic study of adrenal medulla. MIBG scintigraphy has been found to be particularly appropriate for the study of intra- and extra-adrenal, single and multiple, benign and malignant pheochromocytomas. This method has a high overall sensitivity and specificity. Lastly, MIBG scintigraphy is useful in the study of neuroblastoma
Protein Data Bank (PDB) code 7A0L - Joint neutron/X-ray room temperature structure of perdeuterated Aspergillus flavus urate oxidase in complex with the 8-azaxanthine inhibitor and catalytic water bound in the peroxo hole
No full textCoordinates file associated with publication DOI: 10.1107/S205225252001361
A full genomic characterization of the development of a stable Small Colony Variant cell-type by a clinical Staphylococcus aureus strain
No full textAbstract not availableLong M.G. Bui, Stephen P. Kid
Whole body and tomographic scan with 111In-pentetreotide: preliminary data.
No full textSince December 1993, in the 1st Nuclear Medicine Service of the University of Padua, eleven somatostatin-receptor scintigraphic studies with 111In-labelled pentetreotide have been performed. The patients (6 men and 5 women, age 28-68, mean 45 years) were affected by a variety of tumors which supposedly express somatostatin receptors: 2 meningotheliomatous meningiomas post-surgery; 2 glucagonomas with liver metastases observed on CT; 2 patients with suspicion of insulinoma; 2 carcinoids, one after surgery; 1 ectopic-ACTH Cushing's syndrome; 1 intracranial germinoma, post-surgery, in whom the study was requested to evaluate a doubtful finding of pulmonary metastatic lesion on CT; and 1 acromegaly showing, on MRI, and empty sella turcica occupied by and extraflexion of the lower portion of the chiasmatic cisterna without signs of adenoma and the sphenoidal sinus occupied by tissue wit inflammmatory characteristics. Somatostatin-receptor whole body scintigraphy was performed 4 and 24 hours after intravenous injection of 110 MBq 111In-pentetreotide (Octreoscan 111); spot images were acquired when judged necessary. In one case of glucagonoma, a tomographic scan (SPECT) was also performed to better evaluate the spatial relationship between the primitive pancreatic tumor and surrounding tissues. Focal accumulation of 111In-pentetreotide was scintigraphically detected in 5 of the 11 cases. Intense uptake of the radiopharmaceutical was observed in the meningiomas, in the glucagonomas with liver metastases, and in the case of acromegaly, corresponding to a GH-secreting adenoma. The negative scans seem to be true negative scans with the possible exception of one patient with a still unconfirmed suspicion of insulinoma, still not confirmed
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