NOAA Climate Program Office

The genus Dedalopterus Sabatinelli & Pontuale, 1998 from Laos and Vietnam is reviewed: three species are present of which Dedalopterus lexuanhuei Pham, Ahrens & Sabatinelli, new species from Central Vietnam (Ngoc Linh Mts., Annamite Range) is here described. Dedalopterusmalyszi Bunalski, 2001 is present in North Vietnam (Lao Cai, Hoang Lien Son Range), and Dedalopterus pulchellus Sabatinelli & Pontuale, 1998 (= D.bezdekorum Zdek & Krajk, 2007, new synonymy) is known from Northeast Laos (Mt. Xiangkhouang and Mt. Phou Pan). Additional records, an updated checklist, and an identification key of the genus Dedalopterus are provided. All species treated are abundantly illustrated.

ABSTRACT Introduction There is currently no accepted test standard for prosthetic feet to demonstrate durability to impact loading such as that encountered in physically demanding professions (e.g., construction, farming, or military service). The goal of the study was to build a system to pilot test the impact resilience of a selection of prosthetic feet marketed for high-activity prosthesis users. Materials and Methods Three specimens each of nine prosthetic feet (n = 27 total) were selected by prosthetists at the Minneapolis VA Health Care System (with specifications in accordance with an associated human-subjects research study, n = 3). Maximum drop height without failure was used to assess impact resilience. Drop testing was performed using a custom system with an electromagnet to lift and release a weighted frame in increments of 10 cm until failure. The test specimens were organized into three sets, each with one specimen of each foot with the spring category for a particular user mass. Sets A, B, and C were tested with 45.9, 57.8, and 61.5 kg, respectively (101, 127, and 135 lb, respectively) simulating the mass of the user plus an added 22 kg (48 lb) of worn/carried load, then divided by two to represent even load distribution to both legs at impact. Results The feet withstood drop heights without failure ranging from 20 cm to 100 cm. The type of foot was found to significantly affect maximum drop height (P = 0.014). Effect sizes for comparisons of individual feet range from 0.15 to 3.17 with the median effect size being 0.94, which is considered “large.” Conclusions The test system successfully measures impact resilience and is sensitive to foot type. Large effect sizes indicate substantial differences between prosthetic feet marketed for active prosthesis users.

A New Method to Evaluate the Gas Migration for Cement Slurries Zhu Haijin; Zhu Haijin CPOE Search for other works by this author on: This Site Google Scholar Qu Jiansheng; Qu Jiansheng CPOE Search for other works by this author on: This Site Google Scholar Liu Aiping; Liu Aiping CPOE Search for other works by this author on: This Site Google Scholar Zou Jianlong; Zou Jianlong CPOE Search for other works by this author on: This Site Google Scholar Xu Jiaxing Xu Jiaxing CPOE Search for other works by this author on: This Site Google Scholar Paper presented at the International Oil and Gas Conference and Exhibition in China, Beijing, China, June 2010. Paper Number: SPE-131052-MS https://doi.org/10.2118/131052-MS Published: June 08 2010 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Haijin, Zhu , Jiansheng, Qu , Aiping, Liu , Jianlong, Zou , and Xu Jiaxing. "A New Method to Evaluate the Gas Migration for Cement Slurries." Paper presented at the International Oil and Gas Conference and Exhibition in China, Beijing, China, June 2010. doi: https://doi.org/10.2118/131052-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Oil and Gas Conference and Exhibition in China Search Advanced Search Abstract The oil industry wrestled with the problem of gas migration after cementing for many years. As yet an extensive research has been carried out on the problem of gas migration. A lot of corresponding slurries were developed, and most of them have been used successfully in some districts but not total alleviation of the problem. The main reason is the lack of a method to evaluate the gas migration of cement slurries when considering actual well parameters.In this paper, based on previous art of the method to scale-down well parameters to laboratory for more realistic testing of cement recipes, by establishing the method of measuring cement slurries' static gel strength to gain the development of the annular column hydrostatic pressure, a new method to evaluate the gas migration for cement slurries was developed. This method depends on the decline of upper annular column hydrostatic pressure, and can be used to evaluate the ability of the cement slurry in controlling gas migration. Several cement slurries were investigated by this method. The laboratory tests were presented with good repeatability, and could be used to test the ability of cement slurries in controlling gas migration.In field applications, this method has been used in designing cement recipes when cementing gas wells in Chuanyu Area of China. The ability of cement slurries in controlling gas migration has been tested. The field results were consistent with the laboratory tests, and demonstrated the method could be used to guide cement slurries design effectively. Keywords: gel strength, cement recipe, fluid loss, gas migration test, slurry, test temperature, gas zone, procedure, cement property, gas migration Subjects: Casing and Cementing, Cement formulation (chemistry, properties) Copyright 2010, Society of Petroleum Engineers You can access this article if you purchase or spend a download.

The problems of greenhouse warming, ozone depletion and changes in global hydrology are inter-related through a number of feedback mechanisms. Recognized feedbacks act through two important loops involving changes in atmospheric chemistry, UV-B radiation at the earth’s surface, and marine productivity. Reliable predictions of future changes in global and regional climate require an understanding of the direction, magnitude and time constants of the various climatic and biochemical feedback processes. Changes in the amount and distribution of precipitation can also have important feedback effects on soil moisture, vegetation, cloudiness, ground and cloud albedo, ocean salinity (through changes in evaporation and runoff), bottom water formation and productivity. Model studies incorporating these and other feedbacks should be useful in determining the sensitivity of the climate system and anthropogenic changes.