Große Auswahl an günstigen Büchern
Schnelle Lieferung per Post und DHL

Bücher veröffentlicht von LAP Lambert Academic Publishing

Filter
Filter
Ordnen nachSortieren Beliebt
  • 18% sparen
    von Doaa Taher Matrood
    50,00 €

    ¿The Doctors¿ is one of the most well-known daily American talk shows introducing medical advice. It started in 2008 and aired until August 2022. This study aims to find the linguistic representation used by doctors while giving online medical information based on the form of speech used in the discussions. The researcher selected six episodes of ¿The Doctors¿ which can be found easily online by just writing their titles on YouTube. These data have been examined according to Searle¿s speech acts, Grice¿s Maxims, Presupposition and Implicature.

  • 18% sparen
  • 16% sparen
    von Komal Tikariya
    37,00 €

    This book preparation is an effort to cover the practicals of Pharmaceutical engineering to be performed during B.pharm curriculum.Laboratory Manual of Pharmaceutical Engineering is written with the idea of presenting a well documented and well researched student-friendly laboratory manual for the undergraduate students. The main objective of the book is to explain all possible experiments which are to be performed at Pharmaceutical Engineering laboratory at the undergraduate level. This book is written keeping in mind, the need of subject for B. Pharm students, Professionals and Pharmaceutical Industry as a whole. All such information has been included in this book so students are benefited to get them in a single book.The special emphasis is given on the procedure of practicals which will be helpful for the teachers and students with greater ease of understanding the concept of Pharmaceutical engineering. This book will be very helpful to the academicians as well as the industry in understanding the concept of Pharmaceutical engineering.

  • 18% sparen
    von Pasar Abdulkareem Fendi
    79,00 €

    This study examines the legitimacy of Iraqi Kurdistan's claim to self-determination through independence. It analyzes the concept of self-determination, people, as the recipients of this right, statehood, as well as secession, the legality of secession, and the recognition of states founded through this process by the international community. The study is qualitative, library-based, and analytic, involving primary data, such as treaties, statutes, constitutions, parliamentary and ministerial reports, as well as secondary data, including books, journal articles, media, and Internet materials. The study concludes that Iraqi Kurds are an ethnic group who have been denied their right to self-determination and have been subjected to brutal, widespread, and systematic oppression by Iraqi governments since their arbitrary merger with Iraq following World War I. Despite the self-autonomy the Kurds.

  • 19% sparen
    von Yosra Annabi
    69,00 €

    This book brings together my published articles so that they are accessible to everyone. These works were carried out between 2012 and 2023. From a mathematical point of view, most phenomena are modeled by partial differential equations. Since the modeling medium is real, the resolution space is generally three-dimensional. However, nature is well done. Thus, several symmetries and physical properties make it possible to reduce to two dimensions. Therefore, most of the PDEs studied are of the second order with two spatial variables and a temporal variable. As is known, they are classified into three categories: elliptical, parabolic and hyperbolic. Most of the published articles are interested in modeling. The topics covered are multiple: medicine, fluid mechanics, hydrogeology, biology and technology.

  • 19% sparen
    von Mehmet Zile
    65,00 €

    The real-life optimization problems are too complex to be solved by developing a mathematical formula. Heuristic methods are the methods defined to decide the best of a variety of solution actions to solve a problem. Furthermore, it is preferred that heuristic methods are short in solution time and can be applied to different problems. Heuristic methods were developed while trying to find the best solution. The created algorithm, which was based on herd intelligence, was used to solve optimization problems based on the behaviors of bees moving in nature in the process of finding nutrients. By the studies, transformer failures allow us to know without any measurements and tests. In this book, scientific studies have been conducted to improve power transformers. The book contains information about what these innovations are and how to produce the most powerful and efficient transformers. This book will contribute to industry and science on power transformers.

  • 16% sparen
    von S. Sugitha
    37,00 €

    ¿Environmental Pollution and Bioremediation¿ is a comprehensive textbook that covers the fundamental concepts and techniques of Bioremediation and environmental pollution. The book begins with an overview of pollution and classification based on its presence in nature. It also describes the source, effects, and causes of different types of pollution like soil, water, air, and marine pollution. The next half of the book deals with Bioremediation and its techniques, both In situ and Ex situ bioremediation. Finally gives a clear-cut idea about Genetic engineering approaches regarding bioremediation. The work is presented in an approachable and easy-to-understand style, making it suitable for both students and experts in the subject.

  • 19% sparen
    von Abdoul Hamid Derra
    69,00 €

    The management of innovation operations and processes includes the way operations and production complete existing activities and offers options for new innovation activities. It is interested in a broad range of entrepreneurial and organizational issues. The final objective of the technological innovation management is the process of commercialization¿meaning revenue from investments in innovation. The appropriation of value from the investments of companies in technological innovation involves intellectual property rights, granting of licenses, creation of technical standards, speed, secrecy and ownership of additional advantages. Many significant activities carried out by processing companies, marketing, distribution, applied engineering, design, maintenance, accounting would be described as services if they were offered externally. Many services such as bank telling are offered now electromechanical and the value of processing products is now found in intangible properties, such as fast delivery, easy use, brand and reliability that would have been considered as services had they not been embedded in the products.

  • 19% sparen
    von Chongwon Park
    65,00 €

    This study was conducted to find out the effectiveness of my writing instruction and prepare for the following writing instruction in a graduate school context in the Southern part of South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study (N=22) show progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the pretest were Mechanics (Title) > Mechanics (Paragraph Indentation) > Article > Sentence types. 3) As to the remaining errors in the posttest, Sentence types > Mechanics > Meaning > Agreement (Noun) errors survived at the end of the semester. Instructional interventions were quizzes, writing revision, and progressive report. Based upon the findings of the study, instructional intervention, including writing, was suggested as the form of the quizzes in the future.

  • 19% sparen
    von Ruslana Huminilovych
    65,00 €

    The constant increase in energy consumption and rising prices for energy sources stimulate the search for new methods and materials for direct solar energy conversion. A critical analysis of scientific and technical literature shows that only thin-film solar cells (SC) can compete with traditional energy sources. Despite numerous studies on obtaining film coatings using various physical (vacuum deposition, sintering, screen printing, etc.) and chemical (electrochemical deposition, chemical bath deposition, pyrolysis, etc.) methods, the industrial implementation of film-based photovoltaic structures is hindered by the high cost of their production. In monograph the use of chemical surface deposition (CSD) to obtain CdS and CdSe films from aqueous solutions of cadmium-containing salts, will help solve the problem of reducing the cost of SC was described. The relevance of this direction is grounded in the fact that semiconductor photovoltaic structures based on CdS and CdSe films obtained by the CSD method fully meet the physical parameters required for application in thin-film SC.

  • 19% sparen
    von R Sumukh Bharadwaj
    65,00 €

    Root canal therapy or apexification is the standard treatment for teeth that are irreversibly diseased or necrotic. By attempting to repair the injured "pulp-like" tissue, regenerative endodontics can prevent necrosis and maintain the vitality of the teeth. The main clinical benefit is the development of root. The term "pulp-like" tissue does not relate to pulp-dentin complex development or regenerated pulp tissue with an odontoblastic layer. The ability of endogenous stem cells to regenerate tissue is the foundation of the cell homing technology. The term "cell homing" describes the migration or infiltration of endogenous cells into the cite in response to physiological, biochemical, or biological stimuli, or through passive flow in the form of a blood clot from the apical tissue. The American Association of Endodontists has established its success criteria for Regenerative Endodontic Procedures. This Book aims to provide a summary of cell homing as well as a number of strategies for encouraging the regeneration of damaged pulp tissue.

  • 18% sparen
    von Viktor Kuz'min
    53,00 €

    Kniga poswqschena razrabotannoj awtorami original'noj koncepcii informacionnogo polq (IP) molekuly, otkrywaüschej nowyj wzglqd na molekulu, kak ob#ekt, formiruüschij informaciü w okruzhaüschem ego prostranstwe. V ätoj swqzi, koncepciq IP wyhodit za ramki himii i mozhet byt' primenena k lübomu ob#ektu (fizicheskomu telu). Odnako awtory ¿ professional'nye himiki-organiki i poätomu sosredotochili swoe wnimanie na fundamental'nyh aspektah molekulqrnoj struktury i ee wliqniq na swojstwa organicheskih soedinenij w ramkah QSAR/QSPR modelej, ispol'zuq wozmozhnosti razrabotannoj koncepcii IP. Osobo sleduet podcherknut', chto predlagaemaq koncepciq ne ispol'zuet kakih-libo äzotericheskih teorij, swerh#estestwennyh qwlenij i tomu podobnoe. Nasha koncepciq IP baziruetsq tol'ko na estestwenno-nauchnyh predstawleniqh, w osnowe kotoryh lezhit weroqtnostnyj podhod Shennona k izmereniü kolichestwa informacii.Osnownaq zadacha nashej knigi - pokazat' wozmozhnosti razrabotannoj koncepcii IP dlq resheniq raznoobraznyh himicheskih zadach. Uchitywaq uniwersal'nost' nashej koncepcii, my nadeemsq, chto specialisty drugih oblastej smogut transformirowat' nashi idei dlq swoih zadach, gde rassmatriwaütsq drugie (ne molekulqrnye) ob#ekty.

  • 14% sparen
    von Boris Zalesskij
    31,00 €

    Za dewqt' mesqcew 2023 goda Respublika Belarus' poluchila rekordnye ob#emy äxportnoj wyruchki ¿ 31 milliard dollarow. Za poslednie desqt' let äto ¿ maximal'nyj ob#em. I tem ne menee belorusskoe prawitel'stwo aktiwno prorabatywaet whozhdenie na rynki, gde Belarus' zhdut w perwuü ochered', gde u belorusskih äxporterow est' konkurentnye preimuschestwa. Jeto ¿ strany ¿dal'nej dugi¿ w Azii, Afrike i Latinskoj Amerike. Na 2024 god postawlena zadacha uwelichit' ob#emy äxporta w äti strany w 2,5 raza ili pochti na chetyre milliarda dollarow. V chastnosti, w Afrike opredeleny klüchewye opornye tochki dlq whoda w ätot rynok. Jeto ¿ Egipet, Keniq, Nigeriq, Zimbabwe, Juzhno-Afrikanskaq Respublika i Jekwatorial'naq Gwineq. Zaplanirowan rost äxporta prodowol'stwennyh towarow, mashin, oborudowaniq, produkcii himicheskoj promyshlennosti. Belarus' uzhe imeet polozhitel'nyj opyt raboty i w Latinskoj Amerike. I ona nacelena tam na perehod ot prostoj torgowli k sozdaniü sowmestnyh predpriqtij, sborochnyh proizwodstw w Nikaragua, Venesuäle, Brazilii, Jekwadore, na Kube. Kakie shagi po razwitiü ätih tochek rosta belorusskoj storonoj predprinimaütsq segodnq i w blizhajshej perspektiwe? Rech' ob ätom ¿ w predlagaemom issledowanii.

  • 16% sparen
    von M. S. Roobini
    37,00 €

    The rise in Type 2 Diabetes cases has fueled research in robust diagnostic systems. Machine learning integration enhances these systems by analyzing diverse datasets and addressing associated complications like obesity, poor habits, and hypertension. Early detection is crucial, given the severe health implications. ML, paired with natural language processing, aids in prognosis, diagnosis, and prevention plans. Using the PIDD dataset (768 samples, 16 attributes), this research focuses on predicting diabetes with an expanded characteristic set. Pre-processing involves normalization, balancing with SMOTE, and completeness checks to improve model accuracy. Overall, this study emphasizes ML's pivotal role in advancing Type 2 Diabetes understanding and predictive capabilities through meticulous methodologies and dataset selection.

  • 19% sparen
    von Abdoul Hamid Derra
    88,00 €

    The sound of the word ¿customer¿ brings to mind the person using the company¿s products to meet their needs. However, in reality, a chain of intermediaries intervenes between a particular firm and the end consumer of its products. The gathering of information, aiming at obtaining and maintaining clientele, is sought in various ways. The most common are: market research, using various lists of organizations or individuals (who use specific goods because of occupation/ profession) and periodic reports submitted to the company by specialized partners. Client handling is considered as one of the most serious problems of modern business. Some businesses are forced to establish special promotional programs addressed to customer categories. Nevertheless, consumer demand for greater convenience and better service makes the problem even harder. Two different groups of decision makers are being addressed simultaneously: private entrepreneurs (commercial firms, academic firms) and academic entrepreneurs (universities), interested in optimizing knowledge management and in developing heterogeneously composed knowledge-based research networks; and public (governmental, sub governmental) actors.

  • 16% sparen
    von Aamir Al-Mosawi
    37,00 €

    The incidence of chronic renal failure has been disturbingly increasing during the previous decades, and it has been increasingly considered as a global health problem. The availability of renal replacement therapy and its quality are much less in developing countries than in the advanced countries. The lack of effective, convenient and affordable therapy for chronic renal failure in many regions of the world should not mean should that the patients with advanced chronic renal failure are left without other suitable, convenient and acceptable care. Therefore, the need for a more robust and more convenient therapy for chronic renal failure has been increasingly emphasized during the previous two decades. A novel urea lowering dietary therapy that could provide a novel paradigm for the management of chronic renal failure has been described. This new dietary therapy was used in combination with the traditional known therapies of chronic renal failure, and has been increasingly known as intestinal dialysis.

  • 19% sparen
    von Chongwon Park
    74,00 €

    This study was conducted to find out the effectiveness of my writing instruction and prepare for the following writing instruction in a graduate school context in the Southern part of South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study (N=27) show progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the pretest were Mechanics (Title) > Meaning > Adverb > Article. 3) As to the remaining errors in the posttest, Meaning > Article > Mechanics > Adverb > Sentence types (S+V, and S+V) errors survived at the end of the semester. Instructional intervention was quizzes. Based upon the findings of the study, instructional intervention, including writing, was suggested as the form of the quizzes in the future.

  • 19% sparen
    von L. Paul Bernard
    65,00 €

    The reported experiences of burnout and the stress and the potentially negative impact these have on dually credentialed school counselors in providing mental health interventions for students are relevant to the Counseling and Human Services field. These experiences serve as an example for other school-based professionals who want to explore how the challenges faced in applying mental health interventions could impact their own emotional experiences, understanding that any imbalance can potentially negatively impact those they serve. The findings from this research revealed the emotional experiences of apathy and burnout are pervasive in dually credentialed school counselors as they are impacted by both internal and external stressors. Through this understanding, the findings helped to establish an urgency and clear mandate for understanding the negative impact burnout has on school counselors and may invariably impact their own objectivity in incorporating mental health interventions into school counseling programs.

  • 14% sparen
    von María Pilar González González
    35,00 €

    This book analyzes the characteristics of silicon (Si) in the Earth as well as its beneficial and harmful effects in life organisms. Silicon is a metalloid chemistry very common in the universe. On the Earth, it takes the form of sand and minerals such as quartz, amethyst, emerald and others. Si has similar structures than carbon and form part of the skeleton of some organism. Some silicates have been hypothesized that participated in the genesis of the first cells, and several evidences suggest that Si is important for normal growth and biological function in a variety of plants, animals and microbes. The way of life on Earth is based on carbon, water and with a biology based on photosynthesis by plants. The knowledge about life in the Earth is regulated by physical and chemistry laws; however, in other cold environmental may be another type of life based on other biochemistry laws. In this book we present:a) silicon on the Earth, b) the chemistry of silicon, c) the effect of silicon in living organisms such as diatoms, plants and even humans, d) the similarities and differences between Si and C, e) the possibility or no that Si could take part of other life forms.

  • 16% sparen
    von Riddhi Patel
    37,00 €

    This book covers the morphology, taxonomy, reproduction cycle and therapeutic importance of Cordyceps mushroom that has been reported by several research studies all over the world. The information collected and compiled in the book will help researchers who are new to the fungal biotechnology and mycology area. Also, the research scholars and scientists will get supplementary information on medicinal mushroom, Cordyceps life history, background, pharmacological studies and assays, artificial cultivation protocol, challenges and future outcomes etc aspects. For Simpler understanding; the information is divided in to different chapters and further in to para types. The reader will thus get enough idea to understand further work areas. Cordyceps is been in use in traditional Chinese medicine system since several years. Still there is much scope to explore more therapeutic uses & pharmacological effects of Cordyceps. The Cordyceps mushroom has proven as a potential source to cure various serious disorders and diseases due to its rich source of active phytochemicals. In today¿s modern world, we can use latest technologies & advancements to further study the unexploited clinical facets.

  • 16% sparen
    von Sandeep Pratap Singh
    37,00 €

    In Vehicular Ad Hoc Networks (VANETs), vehicles communicate through Vehicle-to-Vehicle (V to V) and Vehicle-to-Roadside Unit (V to RSU) channels, posing challenges for wide deployment. A key issue is designing delay minimization algorithms to handle path disruptions due to vehicle mobility. This dissertation proposes a scheme focusing on reducing delays for high-velocity vehicles, minimizing collision risks. It utilizes low-velocity vehicles to share road status and velocity information, reducing overall traffic in dynamic VANETs. The AODV routing protocol is employed for flooded request and reply, broadcasting specific packets called delay-aware information. Computer simulations using the ns-2 simulator demonstrate the scheme's effectiveness in increasing information delivery, reducing packet overhead, and improving throughput.

  • 19% sparen
    von Chongwon Park
    65,00 €

    This study was conducted to find out the effectiveness of my writing instruction and prepare for the following writing instruction in a graduate school context in the Southern part of South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study (N=22) show progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the post-test were Mechanics > Sentence types (Conjunction S+V, S+V) > Meaning > Mechanics (Title) > Usage. 3) In the pretest, Title > Paragraph indentation > Mechanics > Meaning > Balance errors appeared frequently. Error patterns between pre and post-test did not show idiosyncrasy. Based upon the findings of the study, instructional intervention, including writing, was suggested as the form of the quizzes in the future.

  • 16% sparen
    von Lamyaa Taha
    37,00 €

    In this book, an overview of DL is presented that adopts various perspectives such as state-of-the-arts deep learning techniques, Deep learning approaches, applications. Additionally, the potential problems on deep learning technology. This research presents convolutional neural networks (CNNs) which the most utilized DL network type. A survey of the CNN deep learning architectures that are frequently encountered in the literature, along with their strengths and limitations and describes the development of CNNs architectures together with their main features, e.g., AlexNet, VGG, ResNet, DenseNet, GoogLeNet, Inception: ResNet nd Inception V3/ V4, SegNet, U Net, Point CNN and MASK R-CNN .A detailed study on application of Convolutional Neural Network on the remote sensing to extract features is also explained. Challenges that met CNN were discussed.

  • 14% sparen
    von Viktoriq Vasil'ewna Sawel'ewa
    31,00 €

    Transformaciq w sowremennom mire innowacionnyh reshenij i struktur wertikal'noj i gorizontal'noj sistemnoj integracii komplexnyh chastej, nadsistem i, whodqschih w nih podsistem infrastruktury umnogo proizwodstwa, umnogo transporta, umnoj rabochej sily i umnogo doma w razwituü umnuü integratiwnuü kombinirowannuü sistemu, rezul'tatom komplexnogo wnedreniq i wsestoronnego primeneniq kotoroj dolzhny qwit'sq ¿ uniwersal'nye innowacionnye umnye sistemnye komponenty s älementami iskusstwennogo intellekta i iskusstwennyh nejronnyh setej.

  • 18% sparen
    von Alakanandana Amuru
    50,00 €

    Molecules of compounds are made of more than one type of atom. A simple example of a small molecule is water which contains two hydrogen atoms and one of oxygen. Polymers are very large molecules with many more atoms ranging from 10,000 to 100,000 atoms per molecule. The word polymer is derived from the Greek root poly-, meaning is many and mer- meaning is part or segment. Many of the same units (or mers) are connected together to form a long chain called polymer. Polymers can be extremely large, often made up of hundreds of thousands of atoms. So, they are also referred to as macromolecules. Partly because of their size, polymers have interesting behavior and special properties. Small molecules of water do not tend to get tangled with each other and each one of them is separate and distinct from the others. Whereas, the large molecules of polymers become enmeshed with each other, much like a single strand of cooked spaghetti (noodles) gets tangled up with other strands. The long polymer chains (molecules) intermingle with one another and become entangled. It is very difficult to separate one chain from the remaining chains.

  • 16% sparen
    von Mauro Luisetto
    37,00 €

    Aim of this work is to investigate into the inorganic impurities in API manifacturing and related the charcoal Used in purification and other stages.Because the production of activated charcoal imply variuos chemico-phisical process and really high temperature it is of interest to verify if the exfoliation of graphitic-graphene can produce impurity.The same to verify the analitical methdos to determinate its presence or absence in API production and the requirement asked by regulatory international agency.This aspects can be relavant for toxicological and safey aspects: not only to be evaluated the amorphous Activated charcoal residual but also to search graphitic cristals or planar structure of graphene exfoliated even if under the theresholds reported in regulatory rules.It is not the main focus of this article to put in relation the commercial product showed in this work with the profile of toxicicy of the API purified using this system: only to submit to the researcher some material science concepts useful to better understand some phenomena.

  • 19% sparen
    von Joephin Soundar
    56,00 €

    The goal of modern dentistry is to return patients to normal health in a predictable fashion. The partial and complete edentulous patient may be unable to recover normal function, esthetics, comfort or speech with a traditional removable prosthesis. The patient¿s function when wearing a denture may be reduced to one sixth of that level formerly experienced with natural dentition. However, an implant prosthesis may return the function to near normal limits.The goal of modern dentistry is to return patients to normal health in a predictable fashion. The partial and complete edentulous patient may be unable to recover normal function, esthetics, comfort or speech with a traditional removable prosthesis. The patient¿s function when wearing a denture may be reduced to one sixth of that level formerly experienced with natural dentition. However, an implant prosthesis may return the function to near normal limits.

  • 19% sparen
    von Chongwon Park
    74,00 €

    This study was conducted to find out the effectiveness of my writing instruction and prepare for the following writing instruction in a graduate school context in the Southern part of South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study (N=20) show progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the pretest were Title > Paragraph indentation > Mechanics > Balance > Agreement (Noun). 3) Meaning > Mechanics > Agreement (Noun) > Preposition > Article (a, an) errors survived at the end of the semester. Instructional intervention was quizzes and three assignments: 1) Building better sentences, 2) Collocation, 3) Capitalization, and 4) Participation at http://cafe.daum.net/etwas777. Based upon the findings of the study, instructional intervention, including writing, was suggested as the form of the quizzes in the future.

  • 16% sparen
    von Geyza Costa Cardoso
    37,00 €

    In short, SARS-COV is the virus that causes the coronavirus responsible for the ongoing pandemic that began in 2020, killing thousands of people around the world. Due to this pandemic, educational institutions were closed, and the entire dynamics of classes had to be adapted from in-person teaching to remote teaching, as a result, it is believed that the quality of teaching was compromised. The objective of this study was to verify the performance of students of higher education courses in the chemistry area of the Federal University of Maranhão - UFMA, besides analyzing the perspectives of remote education in the same institution. The methodology used was the data collection extracted from Google Forms available on Google Drive, containing multiple choice questions aimed at remote/hybrid teaching of chemistry, applied to students of the courses of Chemistry Degree, Chemistry Bachelor's Degree, Chemical Engineering and Industrial Chemistry of UFMA. According to the results, 70.20% of the students said that the educational institution made internet available in the pandemic, and many students stressed dissatisfaction with the institution's products.

  • 16% sparen
    von Nirmal Debarma
    37,00 €

    This textbook provides a comprehensive guide to understanding and implementing agricultural worm farming practices. From the basic biology of worms to advanced techniques in vermicomposting, it serves as a valuable resource for farmers, researchers, and students interested in sustainable agriculture and soil health improvement. The intricate interplay between worms and the environment, the science of vermiculture, and the potential for future advancements underscore the importance of acknowledging, valuing, and responsibly managing these small yet influential contributors to soil health and the resilience of agricultural systems. As we continue to unveil the mysteries of the subterranean world, the enduring legacy of agricultural worms in shaping a more sustainable and fruitful future remains perennial.

Willkommen bei den Tales Buchfreunden und -freundinnen

Jetzt zum Newsletter anmelden und tolle Angebote und Anregungen für Ihre nächste Lektüre erhalten.