Global Recovery Rate Research Articles

Bucking at Landing by a Single-Grip Harvester: Fuel Consumption, Productivity, Cost and Recovery Rate

Operating at high efficiency is one of the prerequisites of sustainable forest operations. Typically, harvesters are designed to operate in tree felling and processing operations under the cut-to-length method. However, reasons such as limited business opportunities during the year may negatively affect the machine utilization rate. Coupled with high ownership costs, this results in economic sustainability problems. With this in mind, some practitioners have started to replace the traditional bucking operations conducted motor-manually at the landing with full mechanization using harvesters. This study evaluates the productive performance, fuel consumption, cost, and recovery rate in bucking wood at the landing by a single-grip harvester. A total of 27 bunches were taken into study, containing a total of 232 stems and stem parts, which were processed in 913 logs. A processing work cycle averaged 1.5 min but varied widely between 0.3 and 7 min. Dominant in the productive time were elements such as swinging to grab the stems, swinging to process, and piling the logs, which accounted for 86% of the productive time. Fuel consumption was estimated at 21 L/h and 0.78 L/m3, respectively. Efficiency was estimated at 0.047 PMH/m3, and productivity was estimated at 21.41 m3/PMH; the global recovery rate was 95%, and costs were in the range of 10 to 11 €/m3. Although there were attempts to develop dependence models of time consumption, efficiency, productivity, and recovery rate as functions of stem length, input volume, and the number of processed logs, this worked only for efficiency and productivity. The best-fitted models explained efficiency and productivity by power and linear equations, taking the input volume as a predictor. In addition to their practical application, the results of this study may be important for the planning and control of operations, for comparison to other ways of implementing the landing operations, or for optimizing larger systems.

Material Flow Analysis (MFA) and waste characterizations for formal and informal performance indicators in Tandil, Argentina: Decision-making implications

In cities, the achievement of waste-related legal requirements and the main drivers of Integrated Sustainable Waste Management (ISWM) need adequate indicators and adaptable-to-case tools and strategies. In this work, we combine Material Flow Analysis (MFA) and waste characterizations to develop a mass balance table to design, calculate and analyse indicators related to the formal and informal waste sub-circuits of Tandil, a medium-sized city of the Buenos Aires province (Argentina). Results show that global recovery is very low (2.3% ± 0.16) and mainly driven by the Informal Recovery Sector (IRS). Also, the IRS strategy is more effective, recovering 40% ± 8.0 of its targeted materials from non-household sources. Regarding each material recovery performance, results show significant differences. For paper and board, recovery exceeds 20%. For HDPE, Tetra brik and Ferrous Metals are lower than 1%. In the case of PET and Glass, 9.6 and 9.0% of what is generated in households is recovered, respectively. However, the global recovery rate of each material is different: 2.9% ± 0.4 for PET and 5.5% ± 1.4 for Glass. Our research show that strategies in place are insufficient regarding legislation in force. Even a hypothetically 100% effectiveness in them will account only for 20.9% ± 2.1 of global recovery. Addressing organic waste, therefore, is imperative. Considering the current province law provision of final disposal diversion, accounting for the work of the IRS is key because they recover more waste than the official strategy. Regarding open dumps eradication, we estimate that up to 17% of generated waste is incorrectly final disposed through private skips illegally dumped. A tracking system for skips could avoid this situation.

Direct Pressure Alkaline Leaching of Scheelite Ores and Concentrates

The average global recovery rates for processing scheelite ores by physical methods are normally in the range 50 to 70%, and it is problematic to attain a minimum grade of 60% WO3 in the concentrates without penalizing further this yield. Direct hydrometallurgical processing of low-grade concentrates or medium- to high-grade ores may become an interesting global economic alternative as it allows increasing the recovery rate, avoiding major penalizations due to the grade of the concentrate and increasing the added value of the final product. Leaching of scheelite by sodium carbonate presents several advantages such as its selectivity regarding the dissolution of troubling metals like iron and aluminium, allowing for a simple and flexible process diagram. However, it has the disadvantage that it is performed at high temperature and pressure with a high consumption of reagents. The feasibility of leaching is appraised by the extraction yield and selectivity, but also by the operating cost. Considering these aspects, a relevant objective of the research was to transform alkaline pressure leaching into a feasible processing alternative directly applicable to both medium- and high-grade ores and simultaneously to low- and high-grade concentrates produced by physical methods. The research used ore samples and low-grade concentrates from a typical skarn orebody as well as high-grade concentrates from a chalcopyrite-scheelite orebody. Different operating conditions were tested. Temperature, pressure and reagent concentration showed to be fundamental, but not exclusive, in determining the leaching behaviour. The operating conditions are milder than the ones generally proposed in the literature or currently in use in industry, but with higher carbonate consumptions. The research was oriented towards potential industrial implementation allowing for the application of optimization methods and straight scale-up to pilot-plan design and project.

Emerging and Traditional Organic Markers in Areas with Multiple Anthropogenic Activities: Development of an Analytical Protocol and Its Application in Environmental Assessment Studies.

This work describes the development of an analytical protocol combining cleanup by liquid-solid extraction and GC-MS for the determination of emerging and traditional multi-molecular markers. The procedure was used for the environmental assessment of a coastal region with multiple human activities. Global recovery rates ranged from 45.49% to 119.4% for the 46 substances analyzed: pesticides (73.7%-97.7%), PAHs (52.5%-93.7%), sterols (66.7%-119.4%) and natural and synthetic hormones (45.5%-119.1%) and the rates were compared to those reported in studies on both individual classes and multi-classes of contaminants. The analytical protocol demonstrated satisfactory efficiency and could be used successfully in environmental assessments and source assignment studies. The environmental assessment study revealed that the Acaraú River in northeastern Brazil is influenced by the combination of urban and rural activities. The sources of PAHs are vehicular traffic and the burning of biomass; pesticides stem from pest control in agribusiness and public health campaigns; sterols and hormones stem from a combination of natural inputs, human sewage (treated and raw) and animal husbandry activities.

Selective recovery of valuable metals from spent lithium-ion batteries – Process development and kinetics evaluation

Abstract Recovery of valuable metals from spent lithium-ion battery (LIB) is of both environmental and economic importance. Acidic leaching usually encounters issues of low selectivity or slow kinetics with considerable secondary waste generation during further purification. In this research, a closed-loop process with improved leaching selectivity for recycling of spent LiNixCoyMn1-x-yO2 battery using weak acidic leachant was demonstrated. To obtain optimal conditions of the leaching process, the effects of acid concentration, solid to liquid (S/L) ratio, temperature and reductant content were systematically investigated. Almost all Co, Li, Mn and Ni could be effectively recovered into the solution while Al remained in the residue as metallic form, after one-step leaching. The role of reductant during leaching was further evaluated which was found to be critical for the leaching kinetics. It is clear that the addition of reductant could alter the rate-controlling step of leaching from the ion diffusion in the residue layer to the surface chemical reactions. With high selectivity against impurities, this research proposed and verified a process to recover high purity Li2CO3 from the cathode scrap of LIBs, and more than 90% of the global recovery rate of valuable metals can be achieved.

Lithium Carbonate Recovery from Cathode Scrap of Spent Lithium-Ion Battery: A Closed-Loop Process.

A closed-loop process to recover lithium carbonate from cathode scrap of lithium-ion battery (LIB) is developed. Lithium could be selectively leached into solution using formic acid while aluminum remained as the metallic form, and most of the other metals from the cathode scrap could be precipitated out. This phenomenon clearly demonstrates that formic acid can be used for lithium recovery from cathode scrap, as both leaching and separation reagent. By investigating the effects of different parameters including temperature, formic acid concentration, H2O2 amount, and solid to liquid ratio, the leaching rate of Li can reach 99.93% with minor Al loss into the solution. Subsequently, the leaching kinetics was evaluated and the controlling step as well as the apparent activation energy could be determined. After further separation of the remaining Ni, Co, and Mn from the leachate, Li2CO3 with the purity of 99.90% could be obtained. The final solution after lithium carbonate extraction can be further processed for sodium formate preparation, and Ni, Co, and Mn precipitates are ready for precursor preparation for cathode materials. As a result, the global recovery rates of Al, Li, Ni, Co, and Mn in this process were found to be 95.46%, 98.22%, 99.96%, 99.96%, and 99.95% respectively, achieving effective resources recycling from cathode scrap of spent LIB.

Application of vacuum reduction and chlorinated distillation to enrich and prepare pure germanium from coal fly ash

Germanium, as strategic reserve metal, plays critical role in high-tech industry. However, a contradiction of increasing consumption and scarcity of germanium resource is becoming more and more prominent. This paper proposed an integrated process to recycle germanium from coal fly ash. This technological process mainly consisted of two procedures: vacuum reduction with the purposes of enriching germanium and chlorinated distillation with the purposes of purifying germanium. Several highlights are summarized as follows: (i) Separation principle and reaction mechanism were discussed to understand this integrated process. (ii) Optimum designs and product analysis were developed to guide industrial recycling. The appropriate parameters for vacuum reduction process on the basis of response surface methodology (RSM) were 920.53°C and 259.63Pa, with 16.64wt.% reductant, and for the chlorinated distillation process, adding 8mol/l HCl and L/S 7, 8wt.% MnO2. The global recovery rate of germanium was 83.48±0.36% for the integrated process. (iii) This process overcomes the shortages of traditional process and shows its efficiency and environmental performance. It is significant in accordance with the “Reduce, Reuse and Recycle Principle” for solid waste and further provides a new opportunity for germanium recovery from waste by environment-friendly way.

Employment preservation vs. creditors’ repayment under bankruptcy law: The French dilemma?

The paper investigates the French dilemma associated with court administered resolution of corporate financial distress. In such a legal system, the courts seek a double objective: maintaining job positions through continuation, and determining the best outcome for the claimants. We discuss this dilemma empirically, using a unique sample of bankruptcy files on French SMEs. We address successively three critical questions. First, we highlight the determinants of the final bankruptcy outcome (continuation through reorganization or sale, or piecemeal liquidation): does continuation (the most employment-friendly outcome) depend on the firm's characteristics, and/or on the way the procedure is managed? Second, we study the determinants of the creditors’ recovery rates: do the courts play an active role in increasing recoveries? Third, we address the dilemma directly by focusing on sales as a going concern. We model the court administered selection process between rival buyout offers: do the courts balance the social content against the financial content of each offer? Is there an explicit arbitrage between employment preservation and creditor recoveries? Our main results are: (1) the French courts actively work to facilitate continuation against liquidation, and thus play a role in employment preservation. Besides, we find continuation is more likely to prevail when default is an outcome of specific difficulties (outlets, finance, and production). (2) We confirm the Radulovic (2008) findings: the global recovery rate mainly depends on the firm's ex ante characteristics at the time of triggering, while the way the procedure is managed by the court has little impact. Similarly to LoPucki and Doherty (2007), continuation via reorganization does not generate lower recovery rates on average than the other outcomes. (3) Last, the courts’ choice between rival buyout offers confirms that social considerations prevail in the arbitration. Yet, the courts still consider financial issues as well (a higher sale price increases the chances that an offer is selected), but without clear connection with the amount of due claims (one direct consequence is a moderate recovery rate on sales).

101 Cardiac sarcoidosis: therapeutic management and prognostic factors from a cohort of 130 patients

The diagnosis of cardiac sarcoidosis (CS) (56 female-74 male; 73 White- 36 Black; age at CS: 40.5 ± 11.7 years) was defined by clinical signs (20%) and/or evidence of at least two procedures abnormalities: ECG (64%), echocardiography (71%), Magnetic Resonance Imaging (MRI) (58%) and myocardial scintigraphy (72%). With a 54 month-median follow-up, 124 patients were evaluable. The first line therapy was steroids alone in 57% of cases, steroids with immunosuppressive (IS) drug in 43%. A relapse of the CS was noted in 35 patients, a median time of 27 months. The RR of relapsing at any time was 3.1 times higher in Black (P = 0.008) and 4 times more when baseline abnormal myocardial MRI (P = 0.008). A recovery was achieved by 91 patients (73%), a stabilisation in 23% and 3% worsened. The relative risk (RR) of not recovering at any time was 5.4 times higher in patients who had a steroids treatment duration of less than 24 months (P < 0.0001), 2.4 times higher in patients with a nervous system involvement (P = 0.018) and 3.7 times higher in those who received a first line therapy with weekly methotrexate (P = 0.009). It was 21 times lower in patients who received monthly bolus of cyclophosphamide (CY) (P = 0.004). Death occurred in 13 patients (10%), related to CS in two patients. The 5-year survival rate was 91%. CS had a good prognosis under steroids alone or associated with an IS drug with a global recovery rate of 73% and a 5-year Survival rate of 91%. The risk of not recovering was associated with a steroids treatment duration of less than 24 months, and the use of a methotrexate first line therapy whereas CY was associated with a better prognosis. The identified independent risk-factors for relapsing were Black origin and a baseline abnormal cardiac MRI. This cohort demonstrates the need of maintaining a careful clinical and paraclinical follow-up of patients with a cardiac sarcoidosis with a more than 24-month steroids therapy.

Can Bankruptcy Codes Create Value? Evidence from Creditors' Recoveries in France, Germany, and the UK

The aim of this paper is to provide new evidence on the value-creation process taking place in bankruptcy procedures that belong to different legal systems (French civil law, German civil law, and common law): to do so, we assess to which extent the debtor's value can be preserved under bankruptcy by analyzing the recovery rates in France, Germany, and the United Kingdom. We use a unique European sample of 900 corporate bankruptcy files that were manually collected in commercial courts on the period 1993-2005. We also contribute to the literature by considering the recovery rates on the various classes of claimants (senior claims, junior claims, and new money) for each bankruptcy procedure. Our main conclusions are: (a) France and Germany show quite similar global recovery rates which are greater than in the UK, (b) when controlling for the quality of assets at the beginning of the procedure and for the structure of claims, we observe that recovery rates are not significantly different between France and the UK, while they remain greater for German companies, (c) Germany has the greatest recovery rates for senior and junior creditors, (d) the reorganization procedure and the liquidation procedure leading to the highest global recovery rate are, respectively, the French continuation and the German liquidation.

Multilevel oblique corpectomy without fusion in managing cervical myelopathy: long-term outcome and stability evaluation in 268 patients

The multilevel oblique corpectomy (MOC) allows widening of the spinal canal and foramen trough via an anterolateral access to the cervical spine with control of the vertebral artery and does not require vertebral stabilization or fusion. In the present study, the authors' goal was to demonstrate the long-term efficacy and safety of MOC in the treatment of selected cases of spondylotic myelopathy. The authors conducted a prospective study in a series of 268 patients who underwent MOC for cervical spondylotic myelopathy over a 14-year period. Preoperative and postoperative neurological functioning were evaluated with the modified Japanese Orthopaedic Association scale. Spinal stability was assessed in all patients on serial plain and dynamic cervical radiographs at the last follow-up. The degree of canal expansion after MOC was also measured using the spinal canal/vertebral body ratio, and directly by measuring the diameter of osseous canal on pre- and postoperative CT scans and high-resolution MR images. At a mean follow-up of 96 months, clinical improvement was recorded in 86.6% of patients with a global recovery rate of 87.6%, clinical stability in 8%, and worsening in 5%. Long-term spinal stability was demonstrated in 98% of patients. Multilevel oblique corpectomy was demonstrated to be a safe procedure that provided good results in terms of improved functional status and long-term spinal stability.

Financial Versus Social Efficiency of Corporate Bankruptcy Law: The French Dilemma?

We study the French dilemma associated with court administered resolution of corporate financial distress of firms, in which bankruptcy courts have to combine both social efficiency (maintaining employment) and ex post financial efficiency (determining the best issue for financial distress, proxied here by the global recovery rate). We discuss this dilemma empirically, using a large sample of decisions of French commercial courts concerning the future of bankrupt firms (reorganization, sale as a going concern or liquidation). Addressing this dilemma, we discuss the determinants of bankruptcy courts’ selection between rival offers in sales as a going concern. Finally, we evaluate the financial cost of the French pro debtor system through the recovery rates of various claimants. Our main results are: (1) French commercial courts actively work to protect employment by facilitating continuation and reducing the domino effects of bankruptcy. (2) the courts’ choice between rival buyout offers confirms that social considerations prevail in the arbitration of bankruptcy courts. (3) Continuations through reorganization plans generate the highest recovery rates for all classes of creditors. (4) Contrary to the expected trade-off between social and financial efficiency, courts also enact measures to increase debt recovery once continuation has been chosen. However, for sales, recovery rates are inhibited by asset illiquidity and/or by the courts’ attempt to promote a firm’s continuation through sales at a low price. JEL classification: G33; K22.